Craig Mayer, Nick WIlliams, Vojtech Huser
Lister Hill National Center for Biomedical Communications, National Library of Medicine, NIH, Bethesda, MD

See the full regCTG repository at https://github.com/lhncbc/CRI/tree/master/regCTG

To return to the list of conditions and view other reports go to https://lhncbc.github.io/CRI/regCTG/regCTG-condition_report_links.html


Study Counts

Type Study_count
Total_Studies 1325
interventional 1023
Observational 280
Registry 22

Studies over Time

```

Interventional Trials

Intervention Type

intervention_type Study_Count
Drug 388
Drug|placebo 181
Other 120
Behavioral 86
Device 52
Dietary Supplement 42
Biological 26
Dietary Supplement|placebo 26
Procedure 21
Drug|Other 13
Drug|Procedure 10
Device|Drug 6
Device|Other 6
Biological|Drug 5
Biological|placebo 4
Diagnostic Test 4
Dietary Supplement|Drug|placebo 4
Behavioral|Dietary Supplement 3
Behavioral|Other 2
Behavioral|Procedure 2
Biological|Drug|placebo 2
Biological|Procedure 2
Device|Procedure 2
Dietary Supplement|Drug 2
Drug|placebo|Procedure 2
Behavioral|Device 1
Behavioral|Drug|Procedure 1
Biological|Device|Other 1
Biological|Drug|Other 1
Combination Product 1
Diagnostic Test|Other 1
Dietary Supplement|Drug|Other 1
Dietary Supplement|Other 1
Drug|Other|placebo 1
Other|placebo 1
placebo|Radiation 1
Radiation 1

Count of Studies by Intervention (normalized and mapped)

Interventions over Time

Weekly studies for each intervention

Studies by Country

Country Study_Count
United States 354
NA 86
Japan 55
China 32
Canada 31
United Kingdom 31
France 30
Germany 27
Brazil 24
Korea, Republic of 22
Taiwan 18
United States|Puerto Rico 18
Italy 17
Denmark 15
Netherlands 12
Belgium 11
Mexico 11
Spain 10
Turkey 9
Greece 6
Switzerland 6
Austria 5
Iran, Islamic Republic of 5
United States|Canada 5
India 4
Israel 4
Russian Federation 4
Sweden 4
Australia 3
Hong Kong 3
Paraguay 3
Thailand 3
United States|Japan 3
United States|Poland 3
Argentina 2
Australia|Bulgaria|France|Germany|Hungary|Israel|Italy|Japan|Korea, Republic of|Poland|Romania|Spain|Turkey|United Kingdom 2
Chile 2
Egypt 2
Ireland 2
Norway 2
Philippines 2
Poland 2
Argentina|Australia|Belgium|Brazil|Croatia|Czechia|France|Germany|Greece|Israel|Italy|Korea, Republic of|Lithuania|Malaysia|Mexico|Panama|Philippines|Poland|Russian Federation|Serbia|Singapore|Spain|Sweden|Taiwan|Thailand|Turkey|United Kingdom 1
Argentina|Chile|Czechia|Germany|Hungary|Poland|Romania|Russian Federation|Turkey 1
Argentina|Paraguay 1
Argentina|United States|Australia|Brazil|Bulgaria|France|Hungary|Israel|Italy|Korea, Republic of|Malaysia|Mexico|New Zealand|Poland|Puerto Rico|Russian Federation|South Africa|Spain|Ukraine|United Kingdom 1
Armenia|Georgia|Moldova, Republic of 1
Australia|Austria|Czech Republic|France|Germany|Hungary|Italy|Poland|South Africa|Spain|United Kingdom 1
Australia|Belgium|Bulgaria|Czech Republic|Denmark|Estonia|France|Germany|Greece|Hungary|Israel|Italy|Latvia|Mexico|Poland|Portugal|Romania|Russian Federation|Serbia|Slovakia|Slovenia|Spain|United Kingdom 1
Australia|Belgium|Canada|France|Germany|Greece|Hong Kong|Hungary|Israel|Italy|Korea, Republic of|Poland|Russian Federation|Spain|Taiwan|Thailand 1
Australia|Belgium|France|Germany|Hungary|Italy|Poland|Romania|Russian Federation|Spain|Thailand|Ukraine 1
Australia|Canada|New Zealand 1
Australia|Denmark|France|Germany|United Kingdom 1
Austria|Belarus|Bulgaria|Croatia|Czechia|Finland|France|Georgia|Germany|Hungary|Ireland|Israel|Latvia|Montenegro|Netherlands|North Macedonia|Poland|Portugal|Romania|Russian Federation|Serbia|Slovakia|Slovenia|Spain|Ukraine|United Kingdom 1
Austria|Belgium|Czech Republic|Denmark|Finland|Germany|Israel|Norway|Poland|Sweden 1
Austria|Bulgaria|France|Germany|Italy|Macedonia, The Former Yugoslav Republic of|Poland|Romania|Russian Federation|Ukraine 1
Austria|Czech Republic|France|Germany|Hungary|Italy|Macedonia, The Former Yugoslav Republic of|Malaysia|Poland|Russian Federation|Serbia|South Africa|Spain|Ukraine|United Kingdom 1
Bangladesh 1
Belarus|Belgium|Bulgaria|Colombia|Dominican Republic|Estonia|Georgia|Greece|Guatemala|Hungary|Italy|Panama|Peru|Poland|Romania|Russian Federation|Serbia|South Africa|Spain|Turkey|Ukraine|United Kingdom 1
Belarus|Bulgaria|Croatia|Denmark|Indonesia|Israel|Italy|Latvia|Lithuania|Malaysia|Romania|Singapore|Thailand 1
Belgium|Canada|France|Netherlands|Poland|Spain|United Kingdom 1
Belgium|Czechia|Denmark|Finland|France|Germany|Greece|Italy|Romania|Russian Federation|Slovakia|Spain|Ukraine|United Kingdom 1
Belgium|Denmark|France|Italy|Netherlands|Spain|United Kingdom 1
Belgium|Italy 1
Belgium|United States|Albania|Argentina|Australia|Brazil|Bulgaria|Canada|Chile|Colombia|Czechia|France|Georgia|Hong Kong|Hungary|Israel|Italy|Korea, Republic of|Malaysia|Mexico|Netherlands|New Zealand|North Macedonia|Poland|Portugal|Romania|Serbia|Singapore|Slovakia|Spain|Taiwan|Ukraine|United Kingdom 1
Belgium|United States|Argentina|Australia|Canada|Czechia|Denmark|France|Germany|Hungary|Israel|Italy|Netherlands|Norway|Poland|Puerto Rico|Romania|Russian Federation|South Africa|Spain|Sweden|United Kingdom 1
Bulgaria|Georgia 1
Bulgaria|Moldova, Republic of|Romania 1
Bulgaria|Romania|United Kingdom 1
Bulgaria|South Africa 1
Canada|Germany|United Kingdom 1
Canada|Malaysia|Netherlands 1
Canada|United States|Australia|Austria|Bulgaria|Czech Republic|Denmark|Finland|France|Germany|Greece|Hungary|Israel|Italy|Korea, Republic of|Lithuania|Netherlands|Norway|Poland|Portugal|South Africa|Spain|Sweden|Taiwan|Turkey 1
China|Hong Kong 1
China|Hong Kong|India|Korea, Republic of|Malaysia|Taiwan 1
China|Hong Kong|Japan|Korea, Republic of|Malaysia|Taiwan|Thailand 1
Colombia|Finland|Germany|Guatemala|Korea, Republic of|Philippines|Poland|Romania|Russian Federation|Singapore 1
Croatia|Georgia|Hungary|Serbia|Slovenia 1
Croatia|United States|Austria|Belgium|Czech Republic|Germany|Latvia|Lithuania|Poland|Romania|Russian Federation|Serbia|South Africa|Ukraine|United Kingdom 1
Czech Republic 1
Czech Republic|France|Germany|Hungary|Italy|Lithuania|Poland|Portugal|Serbia|Sweden|Switzerland|Turkey 1
Czechia 1
Czechia|Denmark|Germany|Hungary|Italy|Netherlands|Poland|Spain|United Kingdom 1
Czechia|Germany 1
Czechia|Hungary 1
Denmark|Germany|Hong Kong|Israel|Poland|Singapore|Sweden|Switzerland|United Kingdom 1
Finland 1
France|Germany|United Kingdom 1
France|United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|Czechia|Denmark|Estonia|Germany|Greece|Hungary|India|Italy|Korea, Republic of|Malaysia|Mexico|Netherlands|New Zealand|Norway|Poland|Portugal|Romania|Russian Federation|Singapore|South Africa|Spain|Sweden|Taiwan|Turkey|Ukraine|United Kingdom 1
France|United States|Australia|Austria|Belgium|Canada|Czechia|Denmark|Germany|Greece|Hungary|Israel|Italy|Latvia|Lithuania|Netherlands|New Zealand|Poland|Portugal|Russian Federation|Spain|Sweden|Switzerland|Turkey 1
Georgia|Slovenia 1
Germany|United Kingdom 1
Greece|Slovenia 1
Hungary|Australia|Bulgaria|France|Germany|Israel|Italy|Japan|Korea, Republic of|Poland|Romania|Spain|Turkey|United Kingdom 1
Hungary|Italy|Macedonia, The Former Yugoslav Republic of|Malaysia|Poland|Russian Federation|Serbia|Ukraine 1
Hungary|United States|China|Czechia|France|Israel|Italy|Mexico|Poland|Romania|Slovakia|South Africa|Spain 1
Indonesia 1
Japan|Taiwan 1
Malaysia 1
Moldova, Republic of|Romania 1
New Zealand 1
Peru 1
Poland|United Kingdom 1
Portugal|Spain 1
Romania 1
Russian Federation|Germany|Italy|Poland|Romania|Turkey|Ukraine 1
Serbia 1
Serbia|United States|Bulgaria|Croatia|Georgia|Hungary|Slovenia|Ukraine 1
Singapore 1
Slovakia 1
Sweden|Australia|France|Italy|Spain|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Chile|Colombia|Croatia|Czechia|Egypt|France|Germany|Greece|India|Israel|Italy|Japan|Korea, Republic of|Kuwait|Lebanon|Malaysia|Mexico|Netherlands|Norway|Philippines|Poland|Portugal|Russian Federation|Saudi Arabia|Serbia|Singapore|Slovakia|Slovenia|South Africa|Spain|Sweden|Switzerland|Taiwan|Thailand|Turkey 1
United States|Argentina|Australia|Austria|Brazil|Bulgaria|Canada|Chile|Colombia|Czechia|France|Germany|Hungary|Israel|Italy|Korea, Republic of|Malaysia|Mexico|New Zealand|Poland|Puerto Rico|Romania|Russian Federation|Serbia|Slovakia|South Africa|Spain|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Belgium|Brazil|Bulgaria|Canada|China|France|Germany|Greece|Hungary|India|Israel|Italy|Japan|Malaysia|Mexico|Netherlands|Poland|Russian Federation|Slovakia|South Africa|Spain|Thailand|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Belgium|Brazil|Bulgaria|Canada|Colombia|Czechia|Denmark|Estonia|France|Germany|Greece|Hong Kong|Hungary|India|Israel|Italy|Korea, Republic of|Malaysia|Mexico|Netherlands|New Zealand|Philippines|Poland|Portugal|Romania|Russian Federation|Singapore|South Africa|Spain|Sweden|Taiwan|Thailand|Turkey|Ukraine|United Kingdom|Vietnam 1
United States|Argentina|Australia|Belgium|Brazil|Bulgaria|Canada|Peru|Chile|China|Czechia|Denmark|Estonia|France|Georgia|Germany|Greece|Guatemala|Hungary|India|Israel|Italy|Korea, Republic of|Latvia|Lithuania|Mexico|Netherlands|New Zealand|North Macedonia|Norway|Poland|Portugal|Puerto Rico|Romania|Russian Federation|Serbia|Slovakia|South Africa|Spain|Sweden|Switzerland|Taiwan|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Brazil|Bulgaria|Canada|France|Germany|Israel|Italy|Korea, Republic of|Mexico|Poland|Portugal|Russian Federation|Serbia|Ukraine|United Kingdom 1
United States|Argentina|Australia|Brazil|Canada|France|Italy|Korea, Republic of|Mexico|Poland|Romania|Russian Federation|Spain|United Kingdom 1
United States|Argentina|Australia|Brazil|Canada|France|Italy|Korea, Republic of|Poland|Romania|Russian Federation|Spain|United Kingdom 1
United States|Argentina|Australia|Canada|Germany|India|Italy|Korea, Republic of|Malaysia|Mexico|Poland|Russian Federation|South Africa|Spain|United Kingdom 1
United States|Argentina|Australia|Chile|Colombia|Hong Kong|Korea, Republic of|Malaysia|Mexico|New Zealand|Peru|Philippines|Puerto Rico|Singapore|Taiwan|Thailand 1
United States|Argentina|Brazil|Bulgaria|Canada|Colombia|Czechia|Germany|Hungary|India|Korea, Republic of|Malaysia|Mexico|Peru|Philippines|Poland|Puerto Rico|Romania|Russian Federation|Slovakia|Spain|Taiwan|Thailand|Turkey|Ukraine|Vietnam 1
United States|Argentina|Brazil|Canada|China|Denmark|Germany|Hungary|India|Japan|Korea, Republic of|Mexico|Peru|Philippines|Poland|Russian Federation|Spain|Sweden|Ukraine|United Kingdom|Vietnam 1
United States|Argentina|Brazil|Canada|Colombia|Germany|Hungary|Israel|Italy|Mexico|Poland|Romania|Russian Federation|South Africa|Spain|Ukraine 1
United States|Argentina|Brazil|Canada|Czech Republic|France|Italy|Mexico|Poland|Puerto Rico|Russian Federation|Ukraine 1
United States|Argentina|Brazil|Canada|Czech Republic|Germany|Mexico|Poland|Puerto Rico|Russian Federation|Spain|Ukraine 1
United States|Argentina|Brazil|Colombia|Germany|Hungary|Israel|Italy|Mexico|Poland|Romania|Russian Federation|South Africa|Spain|Ukraine 1
United States|Argentina|Brazil|Germany|Italy|Korea, Republic of|Mexico|Poland|Portugal|Russian Federation|Ukraine 1
United States|Argentina|India|Korea, Republic of|Malaysia|Russian Federation|Singapore|Taiwan|Turkey 1
United States|Australia|Austria|Belgium|Canada|Czechia|France|Germany|Hungary|Israel|Italy|Netherlands|Poland|Russian Federation|Spain|Sweden|United Kingdom 1
United States|Australia|Austria|Belgium|Canada|Czechia|France|Germany|Hungary|Israel|Italy|Poland|Russian Federation|Spain|United Kingdom 1
United States|Australia|Austria|Belgium|Canada|France|Germany|Italy|Poland|Spain|Switzerland 1
United States|Australia|Austria|Belgium|Czech Republic|Denmark|France|Germany|Greece|Italy|Netherlands|Norway|Poland|Portugal|Romania|Spain|Sweden|Turkey|United Kingdom 1
United States|Australia|Belgium|Canada|Czech Republic|France|Germany|Hungary|Israel|Italy|Poland|Spain|United Kingdom 1
United States|Australia|Belgium|Canada|Czechia|France|Germany|Hungary|Israel|Italy|Netherlands|Poland|Russian Federation|Spain|Sweden 1
United States|Australia|Belgium|Canada|Finland|France|Germany|Italy|Norway|Puerto Rico|Sweden|Switzerland|United Kingdom 1
United States|Australia|Belgium|Canada|France|Germany|Greece|Italy|Netherlands|Puerto Rico|Spain|Sweden|United Kingdom 1
United States|Australia|Canada|Czechia|Denmark|France|Germany|Hungary|Japan|Korea, Republic of|Norway|Poland|Russian Federation|Spain|Sweden|United Kingdom 1
United States|Australia|Canada|Czechia|Denmark|France|Germany|Hungary|Japan|Korea, Republic of|Poland|Russian Federation|Spain|Sweden|United Kingdom 1
United States|Australia|Czech Republic|Germany|Italy|Poland|Puerto Rico|Romania|Russian Federation|Spain|Taiwan|United Kingdom 1
United States|Australia|Hong Kong|Israel|New Zealand|Ukraine 1
United States|Austria|Belgium|Canada|Czechia|Denmark|Estonia|France|Germany|Greece|Hungary|Italy|Latvia|Lithuania|New Zealand|Poland|Portugal|Russian Federation|Spain|Sweden|Switzerland|Turkey 1
United States|Austria|Belgium|Croatia|Czech Republic|Germany|Latvia|Lithuania|Poland|Romania|Russian Federation|Serbia|South Africa|Ukraine|United Kingdom 1
United States|Belgium|Canada|Germany|India|Poland|United Kingdom 1
United States|Belgium|Czechia|France|Germany|Greece|Hungary|Italy|Poland|Russian Federation|Ukraine 1
United States|Belgium|Germany|Lithuania|Poland|United Kingdom 1
United States|Brazil|Canada 1
United States|Brazil|Hungary|Mexico|Poland|Romania|South Africa|Spain|Ukraine 1
United States|Bulgaria|Canada|Georgia|Germany|Poland|Ukraine 1
United States|Bulgaria|Croatia|Czech Republic|Germany|Poland|Romania|Russian Federation|Switzerland 1
United States|Bulgaria|Croatia|Georgia|Germany|Hungary|South Africa|Ukraine|United Kingdom 1
United States|Bulgaria|Czech Republic|Germany|Hungary|Italy|Poland|Puerto Rico|Romania|United Kingdom 1
United States|Bulgaria|Czechia|Hungary|Poland|Romania|South Africa|Spain 1
United States|Bulgaria|France|Germany|Italy|Poland|Romania|Spain|United Kingdom 1
United States|Canada|China|Germany|Japan|Malaysia|United Kingdom 1
United States|Canada|Denmark|Germany|Norway|Sweden 1
United States|Canada|Germany 1
United States|Canada|Germany|Russian Federation|Spain 1
United States|Canada|Puerto Rico|Taiwan 1
United States|Canada|United Kingdom 1
United States|Cayman Islands 1
United States|Chile 1
United States|Croatia|Czech Republic|Denmark|Georgia|Hungary|Italy|Serbia|Slovenia|Ukraine 1
United States|Czech Republic|Denmark|Germany|Greece|Italy|Netherlands|Portugal|Russian Federation|Spain|Sweden|United Kingdom 1
United States|France|Germany|Hungary|Italy|Lithuania|Poland|Spain 1
United States|France|Germany|Lithuania|Poland 1
United States|France|Spain|United Kingdom 1
United States|Germany 1
United States|Germany|Greece|Italy|Netherlands|Poland|Portugal|Puerto Rico|Spain|Taiwan 1
United States|Germany|Puerto Rico|United Kingdom 1
United States|Germany|United Kingdom 1
United States|Guatemala 1
United States|Hungary|Lithuania|Mexico|Poland 1
United States|United Kingdom 1
Vietnam 1

Sites per Study

Site_count Study_Count
1 626
2 68
3 24
4 26
5 17
6 7
7 11
8 5
9 5
10 6
11 10
12 9
13 6
14 5
15 9
16 4
17 3
18 7
19 5
20 6
21 6
22 2
23 1
24 2
25 3
26 4
27 2
28 7
29 1
30 4
31 4
32 3
33 4
34 2
35 2
36 4
37 1
38 4
39 4
40 3
41 2
42 1
43 2
44 2
45 3
47 2
49 2
50 2
51 2
52 2
53 4
55 2
56 1
57 2
58 1
59 1
60 2
61 1
62 2
64 1
66 2
68 1
69 1
71 1
72 3
73 3
76 1
83 1
84 1
85 1
89 2
90 2
91 2
98 1
105 2
106 3
107 1
110 1
114 2
115 2
118 2
123 1
124 1
125 1
138 1
141 1
145 1
157 1
169 1
170 1
183 1
184 1
192 1
196 1
203 1
209 1
229 1
231 1
239 1
249 1
278 1
342 1
360 1
381 1
398 1
439 1
465 1
503 1
602 1
754 1

Phase

Phase Study_Count
N/A 363
Phase 3 218
Phase 2 166
Phase 4 156
Phase 1 78
Phase 1/Phase 2 20
Phase 2/Phase 3 16
Early Phase 1 6

Number of Arms

Number_of_Arms Count_of_Studies
1 178
2 584
3 102
4 65
5 19
6 17
7 7
8 4
13 1
NA 46

Number of Updates

Count of Versions Count of Studies
1 96
2 123
3 121
4 134
5 91
6 75
7 43
8 45
9 45
10 30
11 20
12 13
13 12
14 11
15 13
16 9
17 11
18 8
19 8
20 7
21 11
22 6
23 10
24 2
25 5
26 1
27 3
28 3
29 2
30 5
31 2
32 2
33 3
34 5
35 1
36 1
37 5
38 1
39 1
42 2
43 2
44 2
45 1
46 1
47 2
50 1
51 1
52 1
53 1
54 2
57 1
62 1
63 1
64 2
69 1
70 1
71 1
73 1
77 1
78 1
80 1
83 1
91 1
92 1
95 1
97 1
116 1
119 1
120 2
135 1
139 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 8750 927 9.439051
Contacts/Locations 4662 813 5.734317
Recruitment Status 1544 809 1.908529
Study Design 1133 723 1.567082
None (earliest Version on record) 1023 1023 1.000000
Outcome Measures 871 499 1.745491
Eligibility 755 417 1.810552
Arms 640 391 1.636829
Interventions 640 391 1.636829
Study Description 595 338 1.760355
Sponsor/Collaborators 567 391 1.450128
Study Identification 534 344 1.552326
Oversight 354 279 1.268817
References 305 180 1.694444
More Information 291 145 2.006897
Conditions 261 172 1.517442
Results 185 185 1.000000
IPDSharing 163 125 1.304000
Baseline Characteristics 104 92 1.130435
Reported Adverse Events 87 74 1.175676
Participant Flow 76 69 1.101449
Results Submission Events 71 71 1.000000
Documents 61 52 1.173077
2020 Outcome Measures 1 1 1.000000
2020 Study Status 1 1 1.000000
Quality Control Review has not concludedReturned: February 10 1 1 1.000000
Quality Control Review has not concludedReturned: March 17 1 1 1.000000

Enrollment Metrics by Phase

Measure Early.Phase.1 N.A Phase.1 Phase.1.Phase.2 Phase.2 Phase.2.Phase.3 Phase.3 Phase.4
Min. 5.00000 3.0000 5.00000 8.00 1.0000 15.0000 4.0000 2.0000
1st Qu. 12.00000 32.0000 15.25000 21.50 47.2500 36.7500 104.0000 34.0000
Median 21.00000 60.0000 27.00000 33.50 91.0000 61.5000 234.0000 78.0000
Mean 23.16667 471.1536 35.46154 90.55 118.3494 384.8125 657.5853 434.4167
3rd Qu. 37.50000 149.5000 40.00000 61.50 152.5000 163.7500 468.0000 200.2500
Max. 40.00000 28304.0000 205.00000 1000.00 1058.0000 4110.0000 25210.0000 21983.0000

Trial Group Type

group_type Group_Count
Experimental 1134
Active Comparator 548
Placebo Comparator 246
No Intervention 152
Other 111
NA 46
Sham Comparator 12

Intervention Model

intervention_model Study_Count
Parallel Assignment 654
Single Group Assignment 220
Crossover Assignment 118
Factorial Assignment 20
Sequential Assignment 9
NA 2

Primary Purpose

primary_purpose Study_Count
Treatment 708
Prevention 100
Supportive Care 48
Health Services Research 36
Basic Science 35
Other 35
Diagnostic 26
NA 23
Screening 10
Device Feasibility 2

Observational Studies

Studies by Country

Country Study_Count
United States 63
NA 29
United Kingdom 27
France 17
China 13
Germany 13
Belgium 10
Canada 7
Korea, Republic of 7
Austria 6
Denmark 6
Japan 5
Sweden 5
Turkey 5
Israel 4
Russian Federation 4
Spain 4
Greece 3
Italy 3
Netherlands 3
Taiwan 3
Brazil 2
Hungary 2
Macedonia, The Former Yugoslav Republic of 2
Romania 2
Singapore 2
Thailand 2
Albania 1
Argentina|Belgium|Czechia|Denmark|Finland|France|Germany|Hungary|Ireland|Israel|Italy|Lithuania|Luxembourg|Netherlands|Norway|Russian Federation|Saudi Arabia|Serbia|Slovenia|Spain|Sweden|Switzerland|United Kingdom 1
Australia 1
Australia|United Kingdom 1
Austria|Denmark|France|Germany|Italy|Netherlands|Spain 1
Austria|Germany 1
Austria|Germany|Israel|Italy|Netherlands|Poland|Spain 1
Austria|Italy|Netherlands|Spain 1
Belarus 1
Brazil|France|Norway|South Africa|Sweden|Thailand|United Kingdom 1
Bulgaria|Czech Republic|Romania 1
Chile 1
Croatia 1
Croatia|Serbia 1
Czechia 1
Egypt 1
Germany|India|Sri Lanka 1
Hong Kong 1
Pakistan 1
Poland|Austria|Bulgaria|Czech Republic|Greece|Hungary|Italy|Spain 1
Poland|Austria|France|Germany|Italy|Romania|Slovenia|Spain|Switzerland|United Kingdom 1
Portugal 1
Slovenia 1
South Africa 1
Sweden|United Kingdom 1
Switzerland 1
United States|Canada 1
United States|Canada|Israel|Singapore|United Kingdom 1
United States|Germany 1
United States|Italy|Sweden|United Kingdom 1
United States|Puerto Rico 1

Sites per Study

Site_count Study_Count
1 205
2 22
3 8
4 3
5 2
6 3
7 1
8 2
9 1
10 3
11 1
12 4
13 4
14 2
16 1
17 1
18 2
19 1
21 1
22 1
23 1
24 1
26 1
29 1
32 1
40 1
41 1
52 1
69 1
87 1
95 1
108 1

Number of Updates

Count of Versions Count of Studies
1 50
2 43
3 42
4 26
5 27
6 21
7 9
8 6
9 8
10 8
11 5
12 6
13 2
14 1
15 1
16 1
17 4
18 2
21 1
22 2
24 2
28 1
30 1
31 2
37 2
39 1
53 1
54 2
56 1
59 1
79 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 1609 230 6.995652
Contacts/Locations 512 189 2.708995
Recruitment Status 303 184 1.646739
None (earliest Version on record) 280 280 1.000000
Study Design 235 150 1.566667
Study Description 157 95 1.652632
Sponsor/Collaborators 144 95 1.515789
Eligibility 120 82 1.463415
Outcome Measures 115 90 1.277778
Study Identification 100 65 1.538461
Groups 99 77 1.285714
Interventions 99 77 1.285714
Conditions 56 35 1.600000
Oversight 55 50 1.100000
References 47 26 1.807692
Results 29 29 1.000000
IPDSharing 22 19 1.157895
More Information 22 17 1.294118
Baseline Characteristics 4 4 1.000000
Results Submission Events 4 4 1.000000
Documents 3 2 1.500000
Reported Adverse Events 2 2 1.000000
Participant Flow 1 1 1.000000

Enrollment Metrics

Measure Observational
Min 1.000
1st Qu 65.000
Median 181.000
Mean 9038.487
3rd Qu 734.500
Max 1800000.000

Observation Model

observational_model Study_Count
Cohort 177
Case-Only 26
Case-Control 18
Case Control 18
NA 18
Other 14
Case-Crossover 4
Natural History 2
Defined Population 1
Ecologic or Community 1
Family-Based 1

Time Perspective

time_perspective Study_Count
Prospective 185
Cross-Sectional 49
Retrospective 30
Other 7
NA 6
Longitudinal, Retrospective 2
Longitudinal, Prospective 1

Registries

Studies by Country

Country Study_Count
United States 6
NA 4
Taiwan 2
Australia|Germany|United Kingdom 1
Austria 1
Austria|Belgium|France|Germany|Switzerland 1
China 1
Germany 1
India 1
Pakistan 1
Spain 1
Sweden 1
United Kingdom 1

Sites per Study

Site_count Study_Count
1 13
2 1
4 2
9 1
12 1
14 1
18 1
20 1
125 1

Number of Updates

Count of Versions Count of Studies
1 6
2 1
3 4
4 2
5 1
6 1
7 1
8 1
9 1
11 2
12 1
31 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 106 16 6.625000
Contacts/Locations 59 11 5.363636
None (earliest Version on record) 22 22 1.000000
Recruitment Status 17 11 1.545454
Study Design 10 7 1.428571
Outcome Measures 9 6 1.500000
Eligibility 8 8 1.000000
Sponsor/Collaborators 6 5 1.200000
Study Identification 6 5 1.200000
Study Description 5 5 1.000000
Groups 4 4 1.000000
Interventions 4 4 1.000000
IPDSharing 3 3 1.000000
Oversight 3 3 1.000000
References 3 3 1.000000
Conditions 2 2 1.000000
More Information 1 1 1.000000
Reported Adverse Events 1 1 1.000000
Results 1 1 1.000000

Enrollment Metrics

Measure Registries
Min 30.0
1st Qu 212.5
Median 360.5
Mean 318312.0
3rd Qu 2522.5
Max 5940299.0

Registry Model

observational_model Study_Count
Cohort 14
Case-Control 3
Other 2
NA 2
Case-Only 1

Time Perspective

time_perspective Study_Count
Prospective 16
Cross-Sectional 5
NA 1

Follow-up

target_duration Study_Count
1 Day 5
2 Years 4
5 Years 4
1 Year 1
12 Months 1
17 Years 1
18 Months 1
2 Months 1
2 Weeks 1
20 Years 1
24 Months 1
3 Years 1